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The Guinness World Record for the world's smallest dog is held by Miracle Milly, a female Chihuahua who is only 3.8 inches tall and weighs only one pound. At birth, Miracle Milly was so small, she could fit in a teaspoon. In contrast, the Guinness World Record for the world's largest dog is held by Zeus, a male Great Dane. Zeus measured 44 inches tall, about the size of a donkey.